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English: Top: Expected results of Rutherford's gold foil experiment: alpha particles passing through the plum pudding model of the atom undisturbed. Bottom: Observed results: Some of the particles were deflected, and some by very large angles. Rutherford concluded that the positive charge of the atom must be concentrated into a very small ...
Gold ground (both a noun and adjective) or gold-ground (adjective) is a term in art history for a style of images with all or most of the background in a solid gold colour. Historically, real gold leaf has normally been used, giving a luxurious appearance.
Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.
Reproduction of an early electron microscope constructed by Ernst Ruska in the 1930s. Many developments laid the groundwork of the electron optics used in microscopes. [2] One significant step was the work of Hertz in 1883 [3] who made a cathode-ray tube with electrostatic and magnetic deflection, demonstrating manipulation of the direction of an electron beam.
Ink wash painting (simplified Chinese: 水墨画; traditional Chinese: 水墨畫; pinyin: shuǐmòhuà); is a type of Chinese ink brush painting which uses washes of black ink, such as that used in East Asian calligraphy, in different concentrations.
The Black Sun symbol. The Black Sun (German: Schwarze Sonne) is a type of sun wheel (German: Sonnenrad) [1] [2] symbol originating in Nazi Germany and later employed by neo-Nazis and other far-right individuals and groups.
The design is first produced in a computer image file format such as jpg, gif, png. It is then printed on a purpose-made computer printer (as of 2016, most commonly Epson or Ricoh brands) [citation needed] using large heat presses to vaporize the ink directly into the fabric. By mid-2012, the method had become widely used for T-shirts.
Microscopic close-up of aluminium foil on the back of an intumescent rubber strip. Aluminium foil has a thickness less than 0.2 mm (7.9 mils); thinner gauges down to 6 μm (0.24 mils) are also commonly used. [8] Standard household foil is typically 0.016 mm (0.63 mils) thick, and heavy-duty household foil is typically 0.024 mm (0.94 mils).